Get good grades, get involved. If your GPA is high enough, join PTK. Lots of universities have an automatic PTK scholarship (as in, if you are accepted, and are a PTK member, then boom you get $1000 scholarship or whatever) and several more have competitive PTK scholarships. Join any clubs related to your interests. If you’re PolySci, look into College Repubs/Dems, Student Government, multicultural clubs, etc. Great way to make connections and get prof/faculty recommendations too.